Bugfix: Payload (#4)

* Fixed some fields from int to float, fixed timestamp validation

* Added wrapped errors in builder, fixed message formatting

* Fixed test

builder.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 
+	"github.com/pkg/errors"
 	"github.com/samber/lo"
 )
 
@@ -122,24 +123,24 @@ func (b *Builder) Build() (*string, error) {
 	// Validate payload
 	err := b.payload.Validate()
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "payload validation failed")
 	}
 
 	// Sign payload with private key
 	err = b.signature.Sign(b.payload, b.privateKey)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "failed to sign message")
 	}
 
 	payload, err := json.Marshal(b.payload)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "failed to marshal payload")
 	}
 
 	signature, err := json.Marshal(b.signature)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "failed to marshal signature")
 	}
 
-	return lo.ToPtr(fmt.Sprintf("OCMF|%v|%v", payload, signature)), nil
+	return lo.ToPtr(fmt.Sprintf("OCMF|%s|%s", payload, signature)), nil
 }

builder_test.go

@@ -57,7 +57,7 @@ func (s *builderTestSuite) TestBuilder_Valid() {
 	s.Equal(string(RfidNone), builder.payload.IdentificationType)
 	s.Len(builder.payload.Readings, 1)
 	s.Equal("2018-07-24T13:22:04,000+0200", builder.payload.Readings[0].Time)
-	s.Equal(123, builder.payload.Readings[0].ReadingValue)
+	s.Equal(float64(123), builder.payload.Readings[0].ReadingValue)
 	s.Equal(string(UnitskWh), builder.payload.Readings[0].ReadingUnit)
 	s.Equal(string(MeterOk), builder.payload.Readings[0].Status)
 

payload.go

@@ -200,7 +200,7 @@ type PayloadSection struct {
 	MeterSerial   string `json:"MS" validate:"required"`
 	MeterFirmware string `json:"MF,omitempty"`
 	// User assignment
-	IdentificationStatus bool     `json:"IS" validate:"required"`
+	IdentificationStatus bool     `json:"IS"`
 	IdentificationLevel  string   `json:"IL,omitempty" validate:"omitempty,userAssignmentState"`
 	IdentificationFlags  []string `json:"IF" validate:"omitempty,max=4"`
 	IdentificationType   string   `json:"IT" validate:"required,rfidState"`
@@ -221,22 +221,22 @@ func (p *PayloadSection) Validate() error {
 }
 
 type LossCompensation struct {
-	Naming              string `json:"LN"`
-	Identification      int    `json:"LI"`
-	CableResistance     int    `json:"LR"`
-	CableResistanceUnit int    `json:"LU"`
+	Naming              string  `json:"LN"`
+	Identification      int     `json:"LI"`
+	CableResistance     float64 `json:"LR"`
+	CableResistanceUnit string  `json:"LU"`
 }
 
 type Reading struct {
-	Time              string `json:"TM" validate:"required,iso8601"`
-	Transaction       string `json:"TX,omitempty" validate:"omitempty,oneof=B C X E L R A P S T"`
-	ReadingValue      int    `json:"RV" validate:"required"`
-	ReadingIdentifier string `json:"RI,omitempty"`
-	ReadingUnit       string `json:"RU" validate:"required,unit"`
-	ReadingType       string `json:"RT,omitempty" validate:"omitempty,currentType"`
-	CumulatedLoss     int    `json:"CL,omitempty"`
-	ErrorFlags        string `json:"EF,omitempty" validate:"omitempty,oneof=E t"`
-	Status            string `json:"ST" validate:"required,meterError"`
+	Time              string  `json:"TM" validate:"required,iso8601"`
+	Transaction       string  `json:"TX,omitempty" validate:"omitempty,oneof=B C X E L R A P S T"`
+	ReadingValue      float64 `json:"RV" validate:"required"`
+	ReadingIdentifier string  `json:"RI,omitempty"`
+	ReadingUnit       string  `json:"RU" validate:"required,unit"`
+	ReadingType       string  `json:"RT,omitempty" validate:"omitempty,currentType"`
+	CumulatedLoss     float64 `json:"CL,omitempty"`
+	ErrorFlags        string  `json:"EF,omitempty" validate:"omitempty,oneof=E t"`
+	Status            string  `json:"ST" validate:"required,meterError"`
 }
 
 func (r *Reading) Validate() error {

validation.go

@@ -71,7 +71,7 @@ func currentTypeValidator(fl validator.FieldLevel) bool {
 	return isValidCurrentType(CurrentType(fl.Field().String()))
 }
 
-var iso8601WithMillisRegex = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2},\d{3}[+-]\d{4}$`)
+var iso8601WithMillisRegex = regexp.MustCompile(`^(?:19|20)\d{2}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])T(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:Z|-0[1-9]|-1\d|-2[0-3]|-00:?(?:0[1-9]|[1-5]\d)|\+[01]\d|\+2[0-3])(?:|:?[0-5]\d)$`)
 
 func iso8601WithMillisValidator(fl validator.FieldLevel) bool {
 	return iso8601WithMillisRegex.MatchString(fl.Field().String())